im aware of the Ctr pistons have a more domed top than the ITR..how ever...the ITR still has .3:1 compression over the CTR...the Crvtec is the best bang for the buck...no matter how you look at it...you cant argue with this..http://www.importbuilders.com/crated_motors.htm
225hp at the wheels....no ITR/CTR combo is gonna give you that for the price you can buy a Crvtec...